The big businessmen have made the respected publication's list of 15 top entrepreneurs who are expected to up their net worths to break into the Forbes 400 - the countdown of the richest people in America.

TV star Seinfeld is thought to be worth $800 million, while Forbes estimates Cameron is worth $650 million and Woods $500 million.

Jay-Z's portfolio of music, clothing and sports investments places him at $450 million.